CN114243820A - Uninterruptible power supply circuit and power supply method thereof - Google Patents
Uninterruptible power supply circuit and power supply method thereof Download PDFInfo
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- CN114243820A CN114243820A CN202111477979.8A CN202111477979A CN114243820A CN 114243820 A CN114243820 A CN 114243820A CN 202111477979 A CN202111477979 A CN 202111477979A CN 114243820 A CN114243820 A CN 114243820A
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- power supply
- gating module
- voltage converter
- energy storage
- lithium battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention discloses a power supply circuit for uninterrupted power supply and a power supply method thereof, wherein the power supply circuit comprises a lithium battery energy storage system, a first voltage converter and a gating module; the lithium battery energy storage system is connected to the gating module through the first voltage converter; the gating module is connected with the load and is also connected with an external power supply; the gating module is used for selecting an external power supply or a lithium battery energy storage system to supply power to the load. The uninterrupted power supply circuit provided by the invention realizes that the redundant configuration of an external power supply and a lithium battery energy storage system is used as a backup power supply of the auxiliary equipment, and when the external power supply is normal, the external power supply is preferentially used for supplying power to the auxiliary equipment; and when the external power supply is powered off, the lithium battery energy storage system is switched to supply power to the auxiliary equipment. Therefore, the lithium battery energy storage system is used as a backup power supply, so that the reliability of the power supply of the auxiliary equipment is effectively improved, and the time and space cost is greatly reduced.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a power supply circuit for uninterrupted power supply and a power supply method thereof.
Background
The safety problem gradually becomes the primary problem in the construction and large-scale application of lithium battery energy storage power stations. In order to ensure safe and stable operation of the lithium battery energy storage power station, reliable operation of auxiliary equipment (including a BMS battery management system, a fire protection system, an access control system and a control and protection system) of the lithium battery energy storage power station needs to be ensured. Therefore, reliability of the auxiliary device power supply is particularly important.
At present, container type lithium battery energy storage auxiliary equipment is powered by an online UPS (uninterruptible power supply). Fig. 1A and 1B illustrate different gating situations of the auxiliary device power supply when the external power supply 11 is operating normally and is powered off. As shown in fig. 1A, when the external power supply 11 is normal, the external power supply 11 is used as a power supply for the user equipment 14; when the external power source 11 is powered off, as shown in fig. 1B, the user equipment 14 is supplied with power from a battery 13 provided in the UPS (uninterruptible power supply) 12.
However, the secondary battery has several problems: 1. the service life is short, the conventional service life of the storage battery is only 3 years, and the service life of the lithium battery energy storage system is 10 years; 2. the failure rate is high, the storage battery needs to be deeply charged and deeply discharged once every 4-6 months, and in an energy storage application scene, the storage battery in the UPS is always in a floating charging state, deep charging and deep discharging are rarely carried out, so that the failure rate of the storage battery is high; 3. the power supply time is short, the power supply time of the storage battery which is configured conventionally is only 30min, the power supply time of part of control and protection equipment is required to be 2h or longer along with the improvement of the requirement on the safety of the lithium battery, and if the requirement is met, the capacity of the storage battery needs to be increased, so that the installation space and the cost are increased.
Because the storage battery has the problems, the storage battery serving as a backup power supply for supplying power to auxiliary equipment of the energy storage system cannot meet the requirements on reliability and standby power time.
Disclosure of Invention
The invention aims to overcome the defects of short service life, high failure rate and short standby power time when a storage battery is used as a standby power supply of auxiliary equipment of a lithium battery energy storage system in the prior art, and provides a power supply circuit for uninterrupted power supply and a power supply method thereof.
The invention solves the technical problems through the following technical scheme:
in a first aspect, the present invention provides a power circuit for uninterrupted power supply, including a lithium battery energy storage system, a first voltage converter and a gating module;
the lithium battery energy storage system is connected to the gating module through the first voltage converter;
the gating module is connected with a load and is also connected with an external power supply;
the gating module is used for selecting the external power supply or the lithium battery energy storage system to supply power to the load.
Preferably, the gating module is a diode-type gating module;
the power circuit further includes a second voltage converter, and the external power is connected to the diode gating module through the second voltage converter.
Preferably, the first voltage converter is a DC/DC buck converter and the second voltage converter is an AC/DC buck converter.
Preferably, the power supply circuit further comprises a third voltage converter, the diode gating module is connected to the load through the third voltage converter, and the third voltage converter is a DC/AC boost converter.
Preferably, the gating module is a relay type gating module.
Preferably, the power supply circuit further comprises a fourth voltage converter, and the first voltage converter is connected to the bang-bang gating module through the fourth voltage converter.
Preferably, the first voltage converter is a DC/DC buck converter, and the fourth voltage converter is a DC/AC boost converter.
In a second aspect, the present invention provides an uninterruptible power supply method, which is implemented by using the uninterruptible power supply circuit described above, and the uninterruptible power supply method includes:
the gating module detects the power supply voltage of an external power supply;
when the fact that the power supply voltage is lower than the power supply voltage threshold value is detected, the gating module switches the external power supply to supply power for the load to the lithium battery energy storage system to supply power for the load.
The positive progress effects of the invention are as follows: the uninterrupted power supply circuit disclosed by the invention realizes that the redundant configuration of an external power supply and a lithium battery energy storage system is used as a backup power supply of the auxiliary equipment, and when the external power supply is normal, the external power supply is preferentially used for supplying power to the auxiliary equipment; and when the external power supply is powered off, the lithium battery energy storage system is switched to supply power to the auxiliary equipment. Therefore, by using the lithium battery energy storage system as a backup power supply, the reliability of the power supply of the auxiliary equipment is effectively improved, and the time and space cost is greatly reduced. In addition, compared with a storage battery, the lithium battery serving as a power supply has the advantages of long service life, low failure rate, long standby time and the like.
Drawings
Fig. 1A and fig. 1B are schematic diagrams of two gating modes of a power supply of an auxiliary device of a lithium battery energy storage system when an external power supply is in normal operation and is powered off in the prior art.
Fig. 2 is a first structural schematic diagram of an uninterruptible power supply power circuit according to embodiment 1 of the present invention.
Fig. 3 is a second schematic structural diagram of the uninterruptible power supply circuit according to embodiment 1 of the present invention.
Fig. 4 is a third structural schematic diagram of an uninterruptible power supply circuit according to embodiment 1 of the present invention.
Fig. 5 is a fourth schematic structural diagram of the uninterruptible power supply circuit according to embodiment 1 of the present invention.
Fig. 6 is a flowchart illustrating an uninterruptible power supply method according to embodiment 2 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
The embodiment discloses a power supply circuit for uninterrupted power supply, which is used for taking the redundant configuration of a lithium battery energy storage system as a backup power supply of auxiliary equipment of the system so as to improve the efficiency and reliability of supplying power for the auxiliary equipment.
Referring to fig. 2, the uninterruptible power supply circuit includes a lithium battery energy storage system 21, a first voltage converter 22, and a gating module 23;
the lithium battery energy storage system 21 is connected to the gating module 23 through the first voltage converter 22;
the gating module 23 is connected with a load 24, and the gating module 23 is also connected with an external power supply 25;
the gating module 23 is used to select the external power source 25 or the lithium battery energy storage system 21 to supply power to the load 24.
In this embodiment, the details will be described by taking an ac 220V commercial power as the external power supply 25 and an auxiliary device of the lithium battery energy storage system 21 as the load 24 as an example. It should be understood that the ac 220V commercial power is used for illustration only, and is not limited thereto.
Through the first voltage converter 22, the output voltage of the lithium battery energy storage system 21 can be controlled within a range greater than 0 and lower than the output voltage 220V of the external power supply 25, so that the auxiliary equipment can be preferentially supplied with power from the external power supply 25. Then, when the voltage of the external power supply 25 is lower than the voltage threshold, such as power failure, the output voltage is 0, and the output voltage of the first voltage converter 22 is higher than the output voltage of the external power supply 25, so that seamless switching from the state of supplying power by using the external power supply 25 to the state of supplying power to the auxiliary device by using the lithium battery energy storage system 21 can be realized.
Therefore, the uninterruptible power supply circuit in this embodiment uses the redundant configuration of the external power supply 25 and the lithium battery energy storage system as the backup power supply of the auxiliary device, and when the external power supply 25 is normal, the external power supply 25 is preferentially used to supply power to the auxiliary device; and when the external power supply 25 is powered off, the power is switched to the lithium battery energy storage system to supply power to the auxiliary equipment. Therefore, by using the lithium battery energy storage system as a backup power supply, the reliability of the power supply of the auxiliary equipment is effectively improved, and the time and space cost is greatly reduced. In addition, compared with a storage battery, the lithium battery serving as a power supply has the advantages of long service life, low failure rate, long standby time and the like.
In the implementation process, the time level of the power interruption that can be allowed by different auxiliary devices is different, and therefore, the type of the gating module 23 needs to be set according to the time level of the power interruption that can be allowed by the auxiliary devices.
To ensure the gating speed when the time for which the auxiliary device can allow the power interruption is in milliseconds, in a preferred embodiment, as shown in fig. 3, the gating module 23 is a diode-type gating module 231; the power circuit further includes a second voltage converter 31, and the external power source 25 is connected to the diode gating module 231 through the second voltage converter 31.
Based on this, the diode type gating module 231 specifically defined in this embodiment can control the gating time within milliseconds, that is, control the power supply interruption time of the auxiliary device within an allowable time range, so as to ensure that the power supply interruption time generated in the process of switching the power supply does not affect the continuous normal operation of the auxiliary device.
In addition, in order to adapt the diode gating module 231, a second voltage converter 31 is further added between the external power supply 25 and the diode gating module 231 in the present embodiment, so as to meet the requirement of the diode gating module 231 on the voltage type.
Specifically, auxiliary devices, in which the supply voltage required by a BMS (battery management system), water immersion, a temperature and humidity controller, a relay, and shunt tripping is 24V dc and the time allowed for interrupting the power supply is in milliseconds, are used as a first type of auxiliary device, and for such auxiliary devices, preferred embodiments are as follows: the first voltage converter 22 is a DC/DC buck converter and the second voltage converter 31 is an AC/DC buck converter.
Therefore, in the present embodiment, the external power supply 25 outputs the commercial power of 220V AC to the second voltage converter 31, and the second voltage converter 31 serves as an AC/DC buck converter to convert the commercial power of 220V AC to 24V DC required by the first auxiliary device for supplying power.
Moreover, in this embodiment, the output of the lithium battery energy storage system 21 is direct current 1500V, so the first voltage converter 22 is used as a DC/DC buck converter to buck the direct current 1500V output by the lithium battery energy storage system 21 to slightly lower than direct current 24V, such as direct current 23.5V, so as to ensure that the external power supply 25 preferentially supplies power, and at the same time, after the external power supply 25 is powered off and switched to the lithium battery energy storage system 21 to supply power, the voltage output by the battery energy storage system 21 can also meet the power supply voltage required by the first type of auxiliary equipment, so that the battery energy storage system 21 is switched to be used as a backup power supply to supply power to the first type of auxiliary equipment uninterruptedly when the external power supply 25 is powered off.
Since the output voltage of the diode gating module 231 is dc voltage in the above embodiment, the second type of auxiliary devices, such as EMS (energy management system), server, switch, and monitoring host, which allow power interruption for a millisecond time, but require ac 220V for power supply, need to be voltage-converted again to supply power to such auxiliary devices.
Therefore, for the second type of auxiliary equipment requiring alternating current, as shown in fig. 4, the preferred embodiment is: the power supply circuit further comprises a third voltage converter 41, the diode gating module 231 is connected to the load 24 through the third voltage converter 41, and the third voltage converter 41 is a DC/AC boost converter.
In the present embodiment, based on the uninterruptible power supply circuit shown in fig. 3, a DC/AC boost converter as the third voltage converter 41 is further added between the diode gating module 231 and the auxiliary device, so that the DC 24V voltage output by the diode gating module 231 can be converted into the AC 220 voltage required by the second type of auxiliary device, thereby expanding the application range of the uninterruptible power supply circuit in the present embodiment.
In addition to the above two types of auxiliary devices, in the lithium battery energy storage system 21, the load 24 further includes a third type of auxiliary device, such as a smoke exhaust fan, a fire fighting device, etc., which allows the interruption time to be a second-class auxiliary device, and since the requirement of the interruption time by such an auxiliary device does not need to be accurate to millisecond, as a preferred embodiment, the gating module of the uninterruptible power supply circuit is a relay-type gating module 232.
Based on this, the relay-type gating module 232 specifically defined in this embodiment can control the gating time to be at the level of seconds, so as to ensure that the continuous normal operation of the auxiliary device is not affected by the power supply interruption time generated in the power supply switching process. In addition, compared with the diode gating module 231, the relay gating module 232 can also gate the alternating current, so that the universality of the uninterruptible power supply circuit in the embodiment is effectively improved.
For the third type of auxiliary device with the allowable power interruption time of the order of seconds, the required power supply voltage is usually 220V ac, so the preferred embodiment is as follows: based on the power circuit shown in fig. 2, which further includes a fourth voltage converter 51, the first voltage converter 22 is connected to the bang-bang gating module 232 through the fourth voltage converter 51, and the specific structure of the power circuit for uninterruptedly supplying power to the third type of auxiliary device is shown in fig. 5.
In the present embodiment, the external power supply 25 directly outputs the commercial power of 220V ac to the auxiliary device through the relay gating module 232 for power supply. The principle of switching the power supply of the power supply circuit in this embodiment is the same as that of switching the power supply of the power supply circuit shown in fig. 2, and therefore, the detailed description thereof is omitted.
Since the third type of auxiliary device in this embodiment needs AC power as the power supply voltage, and the lithium battery energy storage system 21 in this embodiment outputs DC power with a voltage much larger than the power supply voltage needed by the third type of auxiliary device, in order to meet the requirement of such auxiliary device, as a preferred embodiment, in the power supply circuit shown in fig. 5, the first voltage converter 22 is a DC/DC buck converter, and the fourth voltage converter 51 is a DC/AC boost converter.
Specifically, after the first voltage converter 22 steps down the 1500V dc output by the lithium battery energy storage system 21 to 24V dc, the voltage is then boosted by the fourth voltage converter 51 to 220V ac, and the ac is output to the relay gating module 232, so that the requirement of the third type of auxiliary equipment on the supply voltage can be met.
It should be noted that the third type of auxiliary device may also implement uninterrupted power supply by using the power circuit shown in fig. 4, but when the external power supply 25 normally operates, the auxiliary device gets power from the external power supply 25, and based on this, in the case of normal operation, the power circuit shown in fig. 5 reduces two-stage conversion of AD/DC step-down (implemented by the second voltage converter 31) and DC/AC step-up (implemented by the third voltage converter 41) compared with the power circuit shown in fig. 4, so as to reduce loss, and therefore, a better effect can be obtained by using the power circuit shown in fig. 5 to supply power to the third type of auxiliary device.
Example 2
The present embodiment discloses an uninterruptible power supply method, which is implemented by using the uninterruptible power supply circuit in embodiment 1, and as shown in fig. 6, the uninterruptible power supply method includes:
s1, detecting the power supply voltage of the external power supply by the gating module;
and S2, when the power supply voltage is detected to be lower than the power supply voltage threshold value, the gating module switches the power supply of the load by using the external power supply to the power supply of the load by using the lithium battery energy storage system.
In the specific implementation process, the output voltage of the lithium battery energy storage system is controlled within the range which is larger than 0 and lower than the output voltage of the external power supply, so that the external power supply can preferentially supply power for the auxiliary equipment. Then, when the gating module detects that the power supply voltage of the external power supply is lower than the power supply voltage threshold, the output voltage of the first voltage converter is higher than the output voltage of the external power supply, so that the gating module is triggered to be seamlessly switched from a state of supplying power to the load by using the external power supply to a state of supplying power to the load by using the lithium battery energy storage system.
In addition, the above method for supplying power uninterruptedly is also applicable to the power circuit for supplying power uninterruptedly in other preferred or preferred embodiments in embodiment 1, and since the implementation principles thereof are the same, detailed description is not repeated here.
Therefore, the uninterrupted power supply method in the embodiment realizes that the redundant configuration of the external power supply and the lithium battery energy storage system is used as the backup power supply of the auxiliary equipment, and when the external power supply is normal, the external power supply is preferentially used for supplying power to the auxiliary equipment; and when the external power supply is powered off, the lithium battery energy storage system is switched to supply power to the auxiliary equipment. Therefore, by using the lithium battery energy storage system as a backup power supply, the reliability of the power supply of the auxiliary equipment is effectively improved, and the time and space cost is greatly reduced. In addition, compared with a storage battery, the lithium battery serving as a power supply has the advantages of long service life, low failure rate, long standby time and the like.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (8)
1. A power supply circuit for uninterrupted power supply is characterized by comprising a lithium battery energy storage system, a first voltage converter and a gating module;
the lithium battery energy storage system is connected to the gating module through the first voltage converter;
the gating module is connected with a load and is also connected with an external power supply;
the gating module is used for selecting the external power supply or the lithium battery energy storage system to supply power to the load.
2. The uninterruptible power supply circuit as claimed in claim 1, wherein the gating module is a diode-type gating module;
the power circuit further includes a second voltage converter, and the external power is connected to the diode gating module through the second voltage converter.
3. The uninterruptedly powered power supply circuit of claim 2, wherein the first voltage converter is a DC/DC buck converter and the second voltage converter is an AC/DC buck converter.
4. The uninterruptedly powered power supply circuit of claim 3, further comprising a third voltage converter, the diode gating module being coupled to the load through the third voltage converter, the third voltage converter being a DC/AC boost converter.
5. The uninterruptible power supply circuit as claimed in claim 1, wherein the gating module is a relay-type gating module.
6. The uninterruptedly powered power supply circuit of claim 5, further comprising a fourth voltage converter, the first voltage converter being connected to the bang-bang gating module through the fourth voltage converter.
7. The uninterruptedly powered power supply circuit of claim 6, wherein the first voltage converter is a DC/DC buck converter and the fourth voltage converter is a DC/AC boost converter.
8. A method of uninterruptible power supply, implemented using the uninterruptible power supply circuit of claim 1, the method comprising:
the gating module detects the power supply voltage of an external power supply;
when the fact that the power supply voltage is lower than the power supply voltage threshold value is detected, the gating module switches the external power supply to be used for supplying power to the load through the lithium battery energy storage system.
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| CN202111477979.8A CN114243820A (en) | 2021-12-06 | 2021-12-06 | Uninterruptible power supply circuit and power supply method thereof |
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| CN202111477979.8A CN114243820A (en) | 2021-12-06 | 2021-12-06 | Uninterruptible power supply circuit and power supply method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102917503A (en) * | 2012-10-25 | 2013-02-06 | 常州矽能电子科技有限公司 | LED driver system with energy storage function |
| CN103312027A (en) * | 2013-06-26 | 2013-09-18 | 中国矿业大学 | On-line type mining explosive-proof lithium-ion storage battery uninterrupted DC (Direct Current) power source and control method |
| US20170155276A1 (en) * | 2014-06-26 | 2017-06-01 | Fdk Corporation | Uninterruptible power supply unit |
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2021
- 2021-12-06 CN CN202111477979.8A patent/CN114243820A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102917503A (en) * | 2012-10-25 | 2013-02-06 | 常州矽能电子科技有限公司 | LED driver system with energy storage function |
| CN103312027A (en) * | 2013-06-26 | 2013-09-18 | 中国矿业大学 | On-line type mining explosive-proof lithium-ion storage battery uninterrupted DC (Direct Current) power source and control method |
| US20170155276A1 (en) * | 2014-06-26 | 2017-06-01 | Fdk Corporation | Uninterruptible power supply unit |
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